smelting
roasting
calcinations
froth floatation
✅ The correct answer is option A.
Chemistry MCQs
2. The nucleus of an atom consists of
electrons and neutrons
electrons and protons
protons and neutrons
All of the above
✅ The correct answer is option C.
3. The metal used to recover copper from a solution of copper sulphate is
Na
Ag
Hg
Fe
✅ The correct answer is option D.
4. The number of moles of solute present in 1 kg of a solvent is called its
molality
molarity
normality
formality
✅ The correct answer is option A.
5. The most electronegative element among the following is
sodium
bromine
fluorine
oxygen
✅ The correct answer is option C.
6. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
p-electrons in Ne(Z = 10)
s-electrons in Mg(Z = 12)
d-electrons in Fe(Z = 26)
p-electrons in CI(Z = 17)
✅ The correct answer is option D.
7. Zone refining is used for the purification of
A. Au
B. Ge
C. Ag
D. Cu
✅ The correct answer is option B.
8. The inherited traits of an organism are controlled by
A. RNA molecules
B. nucleotides
C. DNA molecules
D. enzymes
✅ The correct answer is option C.
9. The oil used in the froth floatation process is
A. coconut oil
B. olive oil
C. kerosene oil
D. pine oil
✅ The correct answer is option D.
10. The organic reaction represented by equation CH3 – CH = O + H2NOH gives CH3 – CH – NH + H2O is an example of
A. an addition reaction
B. a condensation reaction
C. an oxidation reaction
D. an elimination reaction
✅ The correct answer is option B.